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Simplifying -5(r + 7) = 77 Reorder the terms: -5(7 + r) = 77 (7 * -5 + r * -5) = 77 (-35 + -5r) = 77 Solving -35 + -5r = 77 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + -5r = 77 + 35 Combine like terms: -35 + 35 = 0 0 + -5r = 77 + 35 -5r = 77 + 35 Combine like terms: 77 + 35 = 112 -5r = 112 Divide each side by '-5'. r = -22.4 Simplifying r = -22.4
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